Three Color Digital Gobo System

ABSTRACT

A system of digitally controlling light output by producing separate control signals for different colors of light. The light is contained in an optical waveguide, either prior to shaping or after shaping. Each of the control signals is coupled to a digitally controlled device which controls the shape of the light output. The digital controlling device can be digital mirror devices, for example.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of and claims priority toU.S. application Ser. No. 11/386,194, filed Mar. 21, 2006; which is acontinuation application of U.S. application Ser. No. 10/995,612, filedNov. 22, 2004, new U.S. Pat. No. 7,020,470; which is a continuation ofU.S. application Ser. No. 10/616,481, filed Jul. 8, 2003, now U.S. Pat.No. 6,823,119; which is a continuation of U.S. application Ser. No.09/771,953, filed Jan. 29, 2001, now U.S. Pat. No. 6,588,944.

BACKGROUND

The U.S. Pat. No. 5,940,204 has suggested using a digital device toshape the contour and outlines of light that is projected through ahigh-intensity projector. Such a system may be used, for example, forstage lighting in theatrical and concert events. The Icon M™, availablefrom Light and Sound Design, Ltd; Birmingham, England, uses thistechnique.

Different patents owned by Light and Sound Design, Ltd. suggest that thedigital gobo should be formed from either a digital mirror, or from anyother pixel level controllable digital device.

Cogent Light of Los Angeles, Calif. has technology that allows packaginga high intensity light beam into a form that allows it to be placed intoa light waveguide, e.g., a fiber optic cable.

SUMMARY

The present application teaches a system of packaging light into a lightwaveguide such as a fiber optic cable, and adjusting the shape of thelight using a digitally controllable, pixel level controllable lightshaping element, such as a digital mirror device (DMD), available fromTexas Instruments.

In one embodiment, the system controls and produces high-intensity lightoutput using three separate digital gobo devices. The digital gobodevices can be separately controlled such that each digital gobo devicereceives information indicative of shaping a separate primary color. Theprimary colors are handled separately, and/or combined at the object ofthe high-intensity light output.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects will now be described in detail with referenceto the accounts, wherein:

FIG. 1 is a block diagram of a three color version of the system.

FIG. 2 shows a flowchart of operation of the controlling process for thedigital gobo's in FIG. 1.

FIG. 3 shows a 3 DMD solution using three optical pipes.

FIG. 4 for shows a single DMD solution.

DETAILED DESCRIPTION

Details of a lighting instrument using a digital gobo are described inmany patents owned by Light and Sound Design Ltd and the basic featuresare also present in Light and Sound Design's Icon M™ lighting fixture.The system described herein may use any of these basic featuresincluding details of computer-controlled cooling, and optics.

A block diagram of the basic system is shown in FIG. 1. An object oflighting 100 is shown. This object may be a stage, or may be any otherobject which is conventionally by a high-intensity lighting device. Thehigh-intensity lighting device may be, for example, a lighting devicewhich produces more than 100 watts of lighting output, preferably morethan 500 watts of lighting output. Devices of this type conventionallyuse a spotlight with a special high intensity bulb for producing thedesired illumination effect.

In FIG. 1, three separate lighting units are formed. Each lighting unitis responsible for producing light of a separate primary color. Theprimary colors can be red, green and blue for additive colors, and cyan,magenta and yellow for subtractive coloration.

Each of the lighting units 110, 120 and 130 are formed of similarstructure. The lighting unit 110 includes a light source 112 whichproduces light of a specified primary color, here red. The lighting unit110 may produce red coloration, or may include a white light with a redfilter, or may even produce pure white light which is later filtered.The light from source 112 is applied to digital gobo device 114. Thedigital gobo device 114 may be a digital mirror device available fromTexas Instruments. Alternatively, the digital mirror device can be someother digitally controllable, pixel level controllable optical devicesuch as, but not limited to, a grating light valve. The digital gobodevice 114 is a controlling computer 140 which runs a specified program142. A controller 150 may be remote from the computer 140, and connectedto the computer by a line 152. For example, the computer 140 may bewithin a separate lighting fixture along with the lighting elements 110,120 and 130, and a remote central controller 150 may be a lightingcontrol console.

The light output from the digital mirror device 114 is focused by anoptics assembly 116, and focused to the input end 118 of an opticalwaveguide 119. The optical waveguide 119 may be, for example, afiber-optic device including single or multiple fibers. The light inputat end 119 is output at end 117, and coupled towards the object 100.Analogously, the other lighting unit 120 focuses its light onto afiber-optic device 129, and the lighting device 130 focuses its lightonto a fiber-optic device 139. Each of the lights may have differentcharacteristics, i.e. they may have different coloration. The output ofthe three fiber-optic devices 119, 129 and 139 are bundled together atarea 136, and are pointed towards the object of lighting 100.

In this way, a number of advantages may be obtained. First, brighterlight and different kinds of control may be obtained since the systemdisclosed herein uses three separate light sources. Moreover, bettercontrol over the digital gobo may be obtained since red; green and blueare separately controlled. Less flickering may be obtained, and morebrightness, as compared with a system that uses only one DMD. Still asystem that uses only one DMD is contemplated as described herein.

Different modifications on this system are possible. Other opticalwaveguides besides a fiber-optic pipe may be used in this system.Moreover, the optical filter which changes each of these separate lightcomponents to a separate light characteristic may be located after thedigital mirror, e.g. as part of the optics assembly 116, or on the inputend of the fiber-optic device 118.

The system is controlled according to the flowchart of FIG. 2. At 200, afile indicative of a shaping of the light, e.g. a gobo to be used, isobtained. This file may be, for example, of the format described in U.S.Pat. No. 6,057,958. Of course, any file format can be used to define thegobo. The definition can be monochrome, gray scale, or full color (threedifferent colors). At 205, the file is changed to an image, andseparated into its primary color components. In the example givenherein, the primary color components may include red, green and blue.Hence the file is separated into red, green and blue components. Suchseparation is conventional in video processing, and produces threeseparate signals. These three separate signals will eventually be usedas the three separate controlling signals 109, 121 and 131 respectivelydriving the red green and blue subassemblies. The control of the threeseparate digital mirror devices is carried out at 210.

FIG. 3 shows an alternative embodiment which uses a similar concept. Inthe FIG. 3 embodiment, light is first launched from a light source 300directly into a fiber-optic cable 310. In this embodiment, the opticsare shown as 315, and are formed directly on the input end of thefiber-optic cable 310. Light is launched into the fiber-optic cable, andhence may be focused and or colored by the optics 315. Of course, thissystem may also use the separate optics shown as 116 in the FIG. 1embodiment. Light is output on the output in 316 of the fiber-opticcable 310, and coupled to a digital mirror device 318 which shapes thelight and reflects it towards the object 100.

The above has described a first channel shown as 299. A separate secondchannel 320 produces a similar light alteration for the second aspect oflight, while a third channel 330 produces a separate output for thethird aspect of light; where the aspects can be colors. Each of thedigital mirror devices may be controlled by the computer shown as 340which may be controlled from a remote console 350.

While the above has described control using three separate colors, itshould be understood that two separate colors could also alternativelybe used. Moreover, while the above describes the different aspects oflight which are separately controlled being colors, it should beunderstood that any different aspect of shaping the beam of light couldbe separately controlled. For example, one alternative might usedifferent intensity lights, each of which are separately controlled toproduce some other kind of effect.

Another embodiment is shown in FIG. 4. In this embodiment, a single DMDsolution is shown. Light from the light 400 is immediately launched intoan optical waveguide, e.g. fiber 405. The fiber can be located in anyconfiguration. It produces its light output 410 at the area of DMD 420.As conventional, the DMD is controlled by a controller 425. An opticalassembly 430 receives the light from the DMD, and transmits it towardsthe object of illumination. The optical element 430 may include a colorchanging element therein, or multiple color changing elements, in orderto produce full-color output. For example, the optical element 430 mayinclude a spinning Red/Green/Blue filter which spins in synchronism withthe changing of patterns on the DMD.

Although only a few embodiments have been disclosed in detail above,other modifications are possible. All such modifications are intended tobe encompassed within the following claims, in which:

1. A lighting assembly comprising: a first lamp which produces a firstlight output, and directs said first light output towards an opticaltarget; a second light lamp which produces a second light output, saidsecond light output being different than said first light output, andsaid second lamp directing said second light output towards said opticaltarget; a digital controllable light altering device, receiving saidfirst light output, and digitally controlling a characteristic of saidfirst light output, said digitally controllable system being located inan area of an output of said first light output, and in an area where anoutput of said digital controllable light altering, representing adigitally controlled light, is added with said second light output ofsaid second lamp.
 2. A light assembly as in claim 1, further comprisinga third lamp, which produces a third light output, wherein said thirdlight output is different than said first light output, and said thirdlight output towards said optical area.
 3. A lighting assembly as inclaim 1, wherein said optical area includes an optical waveguidetherein, which directs said light output towards an object of lighting.4. A lighting assembly as in claim 3, wherein said optical waveguide isan optical fiber.
 5. A lighting assembly as in claim 3, wherein saidoptical waveguide receives light from both said first light output andfrom said second light output.
 6. A lighting assembly as in claim 1,wherein said digitally controllable system includes a digital gobo.
 7. Alighting a system as in assembly as in claim 6, wherein said digitalgobo includes a digital mirror device which is digitally controllable.8. A light assembly as in claim 1, wherein said first light output andsaid second light output have different intensities.
 9. A light assemblyas in claim 1, wherein said first lamp is controlled over a firstchannel, and said second lamp is controlled over a second channel.
 10. Alight assembly as in claim 9, wherein said first and second lamps havedifferent colors.
 11. A lighting device, comprising: a first lightsource which produces a light output; a digital gobo, in a path of saidlight output, which digitally controls said light output; and a secondlight source, which produces a second light output, said second lightsource producing a light output which combines with said first lightoutput, wherein said second light source has a different intensity thansaid first light source.
 12. A lighting device as in claim 11, whereinsaid second light source has a different color than said first lightsource.
 13. A lighting device as in claim 12, further comprising a thirdlight source which produces a different color light than either saidfirst or second light source.
 14. A lighting device as in claim 13,wherein said first, second and third light sources are each primarycolors.
 15. A lighting device as in claim 11, further comprising anoptical waveguide which combines output from said first and second lightsources.
 16. A lighting device as in claim 11, wherein said optical waveguide is an optical fiber.
 17. A lighting device as in claim 13, whereineach of said colors are controlled over different channels.
 18. Alighting control console, comprising: a computer based part thatproduces an output for controlling a first light source on a firstchannel, said part also producing an output for controlling a digitalgobo that changes a shape of a beam projected by said first lightsource, and said part also producing a second output for controlling asecond light source on a second channel, wherein said control producesoutputs from first light source and said second light source to besummed to produce an overall lighting effect.
 19. A console as in claim18, wherein said first light source is controlled to have a differentintensity than said second light source.
 20. A console as in claim 18,wherein said first light source is controlled have a different colorthan said second light source.